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JPH11275678

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11275678
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device used to convert an electrical signal to sound.
[0002]
2. Description of the Related Art A conventional coaxial two-way type loudspeaker apparatus in
which a high frequency range sound source and a mid-low frequency range sound source are
coaxially disposed will be described with reference to the drawings.
[0003]
As shown in FIG. 6, the speaker device 101 includes a high-range vibration system 105 that
generates high-range sound, a high-range magnetic circuit 106 that drives the high-range
vibration system 105, and a mid-low range acoustic system. And a middle bass range magnetic
circuit 108 for driving the middle bass range vibration system 107.
[0004]
The high frequency range vibration system 105 is supported by the frame 109, and as shown in
FIG. 6, the dome-shaped diaphragm 110, the cylindrical bobbin 111 to which one end of the
diaphragm 110 is attached, and the vibration And a flexible edge 112 connected to the outer
periphery of the plate 110.
02-05-2019
1
[0005]
As shown in FIG. 6, the high frequency range magnetic circuit 106 includes a voice coil 114 for
vibrating the high frequency range vibration system 105, a yoke 115 for forming a magnetic
path, and a magnet 116 for applying a magnetic flux to the yoke 115. A top plate 117 is
provided adjacent to the magnet 116 to form a magnetic gap.
[0006]
The voice coil 114 is provided on the outer peripheral portion of the bobbin 111 of the high
frequency range vibration system 105, and is disposed in the magnetic gap portion.
Both ends of the voice coil 114 are connected to connection terminals 110 provided on the outer
peripheral portion of the frame 109 through tinsel wires (not shown).
[0007]
The yoke 115 is formed of a magnetic material in a disk shape, and a cylindrical center pole 118
is provided in a protruding manner at a central portion.
The center pole 118 is inserted into the inner peripheral portion of the bobbin 111 of the high
frequency range vibration system 105.
[0008]
The magnet 116 is formed in an annular shape having a central hole, and the center pole 118 is
inserted through the central hole and provided on the yoke 115.
In the magnet 116, for example, the yoke 115 side is magnetized to the S pole, and the top plate
118 side is magnetized to the N pole.
Further, the yoke 115 is magnetized such that the position adjacent to the S pole side of the
02-05-2019
2
magnet 116 is S pole.
[0009]
The top plate 117 is formed in an annular shape having a central hole by a magnetic material,
and the center pole 118 is inserted through the central hole and provided on the magnet 116.
The top plate 117 has a magnetic gap formed between the inner peripheral portion and the outer
peripheral portion of the center pole 118, and is magnetized to an N pole.
[0010]
The magnetic circuit 106 is covered by a shield cover 119 for preventing magnetic flux from
leaking from the magnetic circuit 106 to the outside, as shown in FIG.
[0011]
The mid-low range vibration system 107 is, as shown in FIG. 6, a substantially conical diaphragm
120 having a through hole at its central portion, and a cylindrical bobbin having one end
attached to the through hole of the diaphragm 120. 121, a flexible edge 122 continuously
provided on the outer peripheral portion of the diaphragm 120, and a flexible and vibration
absorbing damper 123 attached to the bobbin 121.
[0012]
As shown in FIG. 6, the mid-low range magnetic circuit 108 is provided with a voice coil 124 for
vibrating the mid-low range vibration system 107, a yoke 125 for forming a magnetic path, and a
drive for applying a magnetic flux A magnet 126, a top plate 127 provided adjacent to the
driving magnet 126 to form a magnetic gap, and a magnetic flux of the driving magnet 126 are
prevented from leaking to the outside of the mid-low range magnetic circuit 108. A cancellation
magnet 128 is provided.
[0013]
The voice coil 124 is provided on the outer periphery of the bobbin 121 of the mid-low range
vibration system 107, and is disposed in the magnetic gap portion.
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3
Both ends of the voice coil 124 are connected to connection terminals 110 provided on the outer
peripheral portion of the frame 109 via the tinsel cord 130.
[0014]
The yoke 125 is formed of a magnetic material in a disk shape, and a cylindrical center pole 131
is provided in a protruding manner at a central portion.
The center pole 131 is inserted into the inner peripheral portion of the bobbin 121 of the midlow range vibration system 107.
[0015]
The driving magnet 126 is formed in an annular shape having a central hole, and the center pole
131 is inserted through the central hole and provided on the yoke 125.
For example, the yoke 125 side of the driving magnet 126 is magnetized in the S pole, and the
top plate 127 side is magnetized in the N pole. In addition, the position of the yoke 125 adjacent
to the S pole side of the drive magnet 126 is magnetized in the S pole.
[0016]
The top plate 127 is formed in an annular shape having a central hole by a magnetic material,
and the center pole 131 is inserted through the central hole and provided on the driving magnet
126. The top plate 127 has a magnetic gap formed between the inner circumferential portion
and the outer circumferential portion of the center pole 131, and is magnetized to an N pole.
[0017]
The cancel magnet 128 is formed in an annular shape having a central hole, and is provided at
the rear end of the yoke 125. For example, the cancel magnet 128 is magnetized such that the
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yoke 125 side is S pole, and the rear end is N pole.
[0018]
Further, as shown in FIG. 6, the speaker device 101 includes a frame 109 that supports the midlow range vibration system 107. The frame 109 is formed of a metal material in a substantially
cylindrical shape whose diameter is increased from the rear end side toward the front end side. A
holding portion 132 for holding the mid-low range vibration system 107 is formed on the front
end side of the frame 109, and the outer periphery of the edge 122 of the mid-low range
vibration system 107 is not shown in the holding portion 132. It is fixed via a gasket.
[0019]
In the speaker device 101 described above, the voice coil 114, 124 vibrates when a current is
supplied to the voice coil 114, 124, and the high frequency vibration system 105 and the
medium / low range are vibrated with the vibration of the voice coil 114, 124. The diaphragms
110 and 120 of the range vibration system 107 vibrate to generate sounds.
[0020]
Further, as shown in FIG. 7, another speaker device including the high frequency region vibration
system and the high frequency region vibration system 135 and the high frequency region
magnetic circuit 136 which are different from the high frequency region magnetic circuit
provided in the speaker device 101 described above. 102 will be described with reference to the
drawings.
As shown in FIG. 7, the mid-low range vibration system and mid-low range magnetic circuit
included in the speaker device 102 are the mid-low range vibration system 107 and mid-low
range magnetic circuit included in the above-described speaker device 101. Since the same as
108, the same reference numerals are given to the same members and the explanation is omitted.
[0021]
As shown in FIG. 7, the high frequency range vibration system 135 is supported by the medium
low frequency range magnetic circuit 108, and has a cylindrical diaphragm 140 to which a
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5
dome-shaped diaphragm 140 and one end of the diaphragm 140 are attached. A bobbin 141 and
a flexible edge 142 continuously connected to the outer peripheral portion of the diaphragm 140
are provided.
[0022]
As shown in FIG. 7, the high frequency range magnetic circuit 136 applies a magnetic flux to the
voice coil 144 that vibrates the high frequency range vibration system 135, a bottomed
cylindrical yoke 145 that forms a magnetic path, and the yoke 145. And a top plate 147 provided
adjacent to the magnet 146 to form a magnetic gap portion.
[0023]
The voice coil 144 is provided on the outer peripheral portion of the bobbin 141 of the high
frequency range vibration system 135, and is disposed in the magnetic gap portion.
Both end portions of the voice coil 144 are connected to connection terminals 110 provided on
the outer peripheral portion of the frame 109 via tinsel wires (not shown).
[0024]
The yoke 145 is formed of a magnetic material.
The magnet 146 is formed in a cylindrical shape, and is disposed on the bottom of the yoke 145.
For example, the yoke 145 side of the magnet 146 is magnetized in the S pole, and the top plate
147 side is magnetized in the N pole. In addition, the position of the yoke 145 adjacent to the S
pole side of the magnet 146 is magnetized in the S pole.
[0025]
The top plate 147 is formed of a magnetic material in a disc shape, and is provided on the
magnet 146. The top plate 147 has a magnetic gap portion formed between the outer peripheral
portion and the inner peripheral portion of the opening end of the yoke 145, and is magnetized
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6
to an N pole.
[0026]
In the speaker device 102 configured as described above, the voice coils 124 and 144 vibrate
when current flows through the voice coils 124 and 144, and the high-range vibration is
generated along with the vibrations of the voice coils 124 and 144. The diaphragms 140 and
120 of the system 135 and the mid-low range vibration system 107 respectively vibrate to
generate sounds.
[0027]
In the above-described conventional speaker device 101, as shown in FIG. 6, since the high
frequency range sound source interferes with the reproduced sound of the mid low frequency
region sound source, the reproduced sound pressure frequency characteristic is adversely
affected. There was a problem of exerting.
[0028]
For this reason, it is generally considered important to bring the positions of the high frequency
range sound source and the middle low frequency range sound source close to each other.
However, as shown in FIG. There is a disadvantage that the positions of 114 and 124 are
separated in the longitudinal direction of the amplitude direction.
[0029]
Further, in the above-described conventional speaker device 102, as shown in FIG. 7, since the
high frequency range sound source deviates from the amplitude surface of the diaphragm 120 of
the middle low frequency region sound source, the reproduced sound pressure frequency
characteristic is adversely affected. Is avoided.
However, this speaker device 102 is not preferable because the respective sound sources are not
disposed on the same plane in the reproduction sound pressure direction.
[0030]
In addition, the speaker devices 101 and 102 have a problem that the manufacturing cost is
increased by using a magnet having a large magnetic force in order to miniaturize the high
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frequency range sound source.
[0031]
And since the conventional speaker apparatus 101, 102 mentioned above needed to add
separately the magnetic circuit for the sound source for high ranges, there existed a problem that
assemblability fell by the increase in a number of parts. .
[0032]
Therefore, the present invention is a speaker device that enables thinning of the entire device
and arranging the high frequency range sound source and the mid low frequency region sound
source on the same plane with respect to the reproduction sound pressure direction. Intended to
provide.
[0033]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker device
according to the present invention comprises a substantially annular center plate made of a
magnetic material, and magnetic pole directions for repelling the center plate by sandwiching the
center plate therebetween. A magnetic circuit is provided which has a pair of substantially
annular magnets disposed facing each other, and which forms magnetic fields on the inner and
outer peripheral portions of the center plate.
The speaker device includes a first vibration system having a first diaphragm disposed on the
inner peripheral side of the center plate of the magnetic circuit and driven by the magnetic
circuit, and an outer peripheral portion of the center plate of the magnetic circuit. It has a second
vibrating plate disposed on the side and driven by a magnetic circuit, and includes a first
vibrating plate and a second vibrating system having a different generation range.
[0034]
In the speaker device configured as described above, magnetic fields are formed on the inner and
outer circumferential portions of the magnetic circuit.
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The speaker device vibrates the first and second vibration systems having different sound
emission areas by a single magnetic circuit.
[0035]
Further, in the speaker device according to the present invention, the first diaphragm and the
second diaphragm are formed in a substantially flat plate shape, and disposed so that the
respective main surfaces are positioned substantially on the same plane. .
[0036]
In the speaker device configured as described above, the first and second diaphragms having
different sound generation ranges are respectively positioned on substantially the same plane
with respect to the reproduction sound pressure direction, so that the reproduction sound quality
is improved.
Further, according to this speaker device, the thickness in the amplitude direction of the first and
second vibration systems can be reduced by positioning the first and second diaphragms on
substantially the same plane.
[0037]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of a
specific embodiment of the present invention, with reference to the drawings.
As shown in FIG. 1, the speaker device 1 includes a high frequency vibration system 5 that
generates high frequency sound, a mid low frequency vibration system 6 that generates medium
low frequency sound, and these high frequency vibration systems. And 5 and a magnetic circuit 7
for driving the mid-low range vibration system 6.
Further, as shown in FIG. 1, the speaker device 1 includes a frame 8 that supports the high
frequency range vibration system 5, the middle low frequency range vibration system 6, and the
magnetic circuit 7.
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[0038]
As shown in FIG. 1, the high frequency range vibration system 5 has a substantially conical
diaphragm 10 having a through hole at the center and a cylindrical bobbin 11 having one end
attached to the through hole of the diaphragm 10. And a flexible edge 12 continuously
connected to the outer peripheral portion of the diaphragm 10, and a dome-shaped cap 13
attached so as to close the through hole of the diaphragm 10.
[0039]
The mid-low range vibration system 6 is, as shown in FIG. 1, a substantially conical diaphragm
15 having a through hole at its central portion, and a cylindrical bobbin having one end attached
to the through hole of the diaphragm 15. A flexible edge 17 continuously connected to the outer
peripheral portion of the diaphragm 10 and a flexible and vibration absorbing damper 18
attached to the bobbin 16 are provided.
[0040]
As shown in FIG. 1, the magnetic circuit 7 includes voice coils 21 and 22 for vibrating the
diaphragms 10 and 15 of the high frequency range vibration system 5 and the mid low
frequency range vibration system 6, and a center plate for forming a magnetic path. And a pair of
magnets 24 and 25 for applying a magnetic flux to the center plate 23.
[0041]
The voice coil 21 is provided on the outer periphery of the bobbin 11 of the high frequency
range vibration system 5 and is provided on the inner periphery of the magnetic circuit 7.
Both ends of the voice coil 21 are connected to connection terminals 28 provided on the outer
peripheral portion of the frame 8 through the tinsel wires 27.
[0042]
The voice coil 22 is provided on the outer periphery of the bobbin 16 of the mid-low range
vibration system 6 and is provided on the outer periphery of the magnetic circuit 7.
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10
Both ends of the voice coil 22 are connected to connection terminals 28 provided on the outer
peripheral portion of the frame 8 through the tinsel wires 27.
[0043]
The center plate 23 is annularly formed of, for example, a magnetic material such as a hot forged
steel plate, and is disposed on the inner peripheral portion of the bobbin 16 of the mid-low range
vibration system 6.
[0044]
For example, an anisotropic rare earth sintered magnet such as a neodymium magnet is used as
the magnets 24 and 25 and is formed in an annular shape having a central hole.
The magnets 24 and 25 are formed such that the outer diameter is slightly smaller than the
outer diameter of the center plate 23, and the inner diameter of the central hole is formed
slightly larger than the inner diameter of the central hole of the center plate 23.
The magnets 24 and 25 are disposed with their center holes aligned with the center hole of the
center plate 23, respectively, and the outer peripheral portion and the inner peripheral portion of
the center plate 23 are respectively projected from the outer peripheral portion and the central
hole. There is.
[0045]
The magnets 24 and 25 are disposed on both sides of the center plate 23, with the directions of
the repelling magnetic poles facing each other by sandwiching the center plate 23 therebetween.
That is, for example, the center plate 23 side in the thickness direction of each of the magnets 24
and 25 is magnetized in the N pole, and the other side is magnetized in the S pole. Therefore, the
magnetic circuit 7 forms a repulsive magnetic field.
02-05-2019
11
[0046]
In the magnetic circuit 7 configured as described above, as shown in FIG. 1, the outer peripheral
portion of the edge 12 of the high frequency range vibration system 5 is attached via the annular
edge ring 26 provided on the magnet 24. Being fixed. In the magnetic circuit 7, the bobbin 16 of
the mid-low range vibration system 6 is disposed at the outer periphery, and the bobbin 11 of
the high-range oscillation system 5 is disposed at the inner periphery.
[0047]
As shown in FIG. 1, the frame 8 is formed of a metal material in a substantially cylindrical shape
whose diameter is increased from the rear end side toward the front end side. A holding portion
29 for holding the mid-low frequency vibration system 6 is formed on the front end side of the
frame 8, and an outer peripheral portion of the edge 17 of the mid-low range vibration system 6
is annular in the holding portion 29. It is fixed via a gasket not shown. Further, the frame 8 is
provided with a connection terminal 28 connected to the voice coils 21 and 22 via the tinsel wire
27 at the outer peripheral portion, and a connection line of an external power supply (not shown)
is connected to the connection terminal It is done.
[0048]
In the speaker device 1 described above, when current is supplied to the voice coils 21 and 22 of
the magnetic circuit 7, the voice coils 21 and 22 vibrate according to the law of Fleming left
hand, causing the voice coils 21 and 22 to vibrate. Accordingly, the diaphragms 10 and 15 of the
high frequency range vibration system 5 and the middle low frequency range vibration system 6
respectively vibrate to generate sounds.
[0049]
The magnetic flux distribution of the magnetic circuit 7 configured as described above will be
described with reference to the drawings.
In FIG. 2, the vertical axis indicates the position in the thickness direction of the magnetic circuit
6 parallel to the amplitude direction of the high frequency range vibration system 5 and the mid
low frequency range vibration system 6, and the horizontal axis indicates the direction of
02-05-2019
12
magnetic flux. . Moreover, in FIG. 2, the arrow shows the direction of a magnetic force line.
[0050]
As shown in FIG. 2, in the magnetic circuit 7, magnetic fields having substantially the same
magnetic flux density are formed on the inner and outer peripheral portions. As shown in FIG. 2,
in the magnetic circuit 7, the position facing the outer periphery of the center plate 23 has the
largest magnetic flux density in the magnetic field. In the magnetic circuit 7, the magnetic flux
density gradually decreases as it is separated from the center plate 23 in the thickness direction,
and the direction of the magnetic flux changes in the opposite direction at the central portion in
the thickness direction of each of the magnets 24 and 25.
[0051]
Further, in the magnetic circuit 7, the magnetic flux in the reverse direction gradually increases
as it is separated from the center plate 23 in the thickness direction from the central portion in
the thickness direction of the magnets 24, 25 and is separated from the end of the magnets 24,
25 As it does, the magnetic flux gradually decreases. The magnetic circuit 7 vibrates the highrange vibration system 5 and the mid-low range vibration system 6 disposed on the inner
circumferential side and the outer circumferential side, respectively.
[0052]
A conventional magnetic circuit for forming a repulsive magnetic field will be described with
reference to the drawings. For example, as shown in FIG. 8, in the magnetic circuit 200, a discshaped center plate 201 made of a magnetic material and magnetic poles for repelling the center
plate 201 with the center plate 201 interposed therebetween are opposed to each other. And a
pair of magnets 202 and 203 in the shape of a disk. In the magnets 202 and 203, for example,
the center plate 201 side in the thickness direction is magnetized to the N pole, and the other
side is magnetized to the S pole.
[0053]
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13
The conventional magnetic circuit 200 forms a magnetic field only at the outer peripheral
portion of the disk-shaped center plate 201, as shown in FIG. However, as shown in FIG. 2, the
magnetic circuit 7 according to the present invention forms magnetic fields on the inner and
outer peripheral portions of the center plate 23, respectively. The high frequency range vibration
system 5 and the middle low frequency range vibration system 6 can be positioned on
substantially the same plane.
[0054]
The speaker device 1 according to the present invention may be configured to include another
magnetic circuit 37 as shown in FIG. 3, for example.
[0055]
As shown in FIG. 3, in the magnetic circuit 37, an annular center plate 38 made of a magnetic
material and a magnetic pole direction for repelling the center plate 38 with the center plate 38
interposed therebetween are opposed to each other. And a pair of annular magnets 39, 40
disposed.
In the magnets 39 and 40, for example, the center plate 38 side in the thickness direction is
magnetized to the N pole, and the other side is magnetized to the S pole.
[0056]
Then, on the inner peripheral portion of the center plate 38 included in the magnetic circuit 37,
chamfered portions 41 are respectively formed across the corners on both sides in the thickness
direction. That is, in the center plate 38, the width of the inner peripheral surface in the direction
parallel to the amplitude direction of the diaphragm 10 is smaller than the width of the outer
peripheral surface. Therefore, the center plate 38 of the magnetic circuit 37 vibrates the high
frequency range vibration system 5 which does not require a relatively large amplitude by
reducing the width of the inner peripheral surface in the direction parallel to the amplitude
direction of the diaphragm 10. The magnetic flux of the inner peripheral portion acting on the
voice coil 21 for focusing is concentrated at the central portion in the thickness direction.
Although not illustrated, the inner peripheral portion of the center plate 38 is not limited to the
shape in which the chamfered portion 41 is formed, and any other shape that concentrates the
magnetic flux in the inner peripheral portion, for example Of course, it may be formed in the
02-05-2019
14
shape of
[0057]
As described above, the speaker device 1 includes the center plate 23 having an annular shape,
and the magnets 24 and 25 in which the magnetic pole directions for repelling the center plate
23 are opposed to each other. The magnetic field is formed on the inner and outer peripheral
portions of the center plate 23, respectively, so that the high-range sound source and the midlow range sound source can be disposed on the same plane in the reproduction sound pressure
direction. . Therefore, according to this speaker device 1, it is possible to provide a coaxial twoway type speaker device in which the sound source positions of the reproduction sound pressure
in the high range and the middle low range match exactly.
[0058]
Further, since the speaker device 1 has a simplified structure by not requiring a plurality of
magnetic circuits, it is troublesome to combine two magnetic circuits magnetized as in the
conventional speaker devices 101 and 102 described above. Assembly work is not required, and
assemblability is improved.
[0059]
In the above-described speaker device 1, the high frequency range vibration system 5 is
configured to include the cone-shaped diaphragm 10, for example, as shown in FIG. 4, the high
frequency range vibration system has a dome shaped vibration plate 46. It may be configured to
have
The other members of the speaker device 2 except for the high frequency range vibration system
45 have substantially the same configuration as that of the above-described speaker device 1,
and therefore, the same members are denoted by the same reference numerals and the
description thereof will be omitted.
[0060]
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15
The high frequency range vibration system 45 included in the speaker device 2 is supported by
the magnet 24 of the magnetic circuit 7 as shown in FIG. 2, and a dome-shaped diaphragm 46
and one end of the diaphragm 46 are attached. It has a cylindrical bobbin 47 and a flexible edge
48 connected to the outer peripheral portion of the diaphragm 46. The bobbin 47 has the voice
coil 21 of the magnetic circuit 7 wound around the outer peripheral portion, and is disposed on
the inner peripheral portion of the magnetic circuit 7.
[0061]
In the high frequency range vibration system 45 configured as described above, when current is
supplied to the voice coil 21 of the magnetic circuit 7, the voice coil 21 vibrates according to the
Fleming left-hand rule. The diaphragm 46 vibrates to generate sound in accordance with the
vibration.
[0062]
The above-described speaker devices 1 and 2 employ so-called cone-type diaphragms 10 and 15
as the high frequency range vibration system 5 and the mid-low frequency range vibration
system 6, respectively, but have approximately flat plate-like vibration plates Still another
speaker device will be described with reference to the drawings.
[0063]
As shown in FIG. 5, the speaker device 3 includes a treble range vibration system 55 that
generates a treble range sound, a middle bass range vibration system 56 that generates a middle
bass range sound, and the treble range vibration system 55 and a magnetic circuit 57 for driving
the mid-low range vibration system 56.
Further, as shown in FIG. 5, the speaker device 3 is provided with a frame 58 for supporting the
high frequency range vibration system 55, the middle low frequency range vibration system 56,
and the magnetic circuit 57.
[0064]
As shown in FIG. 5, the high frequency range vibration system 55 includes a disk-shaped
diaphragm 60 and an elastic support member 62 that supports the outer peripheral portion of
the diaphragm 60 in a displaceable manner.
02-05-2019
16
[0065]
The vibrating plate 60 is formed to a desired thickness by a relatively lightweight flat plate
having an air gap inside or on a surface of, for example, a honeycomb structure, a foam structure
made of foam mica or the like.
The diaphragm 60 is disposed on the inner peripheral side of the magnetic circuit 57.
[0066]
As shown in FIG. 5, the elastic support member 62 is formed in a substantially annular shape by
a material having elasticity.
An inner peripheral portion of the elastic support member 62 is attached to an outer peripheral
portion of the diaphragm 60, and an outer peripheral portion is attached to an inner peripheral
portion of the magnetic circuit 57.
[0067]
The mid-low range vibration system 56 is, as shown in FIG. 5, an annular diaphragm 65 having a
through hole at its central portion, and a pair of substantially annular rings for displacingly
supporting the outer peripheral portion of the diaphragm 65. And a cap 63 for displaceably
supporting the inner peripheral portion of the diaphragm 65.
[0068]
The vibrating plate 65 is formed to a desired thickness by a relatively lightweight flat plate
having a void in the inside or the surface of, for example, a honeycomb structure, a foam
structure made of foam mica or the like.
A magnetic circuit 57 is disposed in the through hole of the diaphragm 65.
02-05-2019
17
[0069]
As shown in FIG. 5, the elastic supporting members 66 and 67 are formed of a material having
elasticity in the form of a corrugated section or a roll having a concentric shape. The pair of
elastic support members 66 and 67 are provided in line symmetry to and in parallel with each
other with respect to the center line in the thickness direction of the diaphragm 65. The elastic
support members 66 and 67 each have one end attached to both sides in the thickness direction
of the outer peripheral portion of the diaphragm 65, and the other end attached to the annular
edge ring 76 provided on the frame 58. It is attached.
[0070]
That is, the elastic supporting members 66 and 67 support the diaphragm 65 at predetermined
intervals in the thickness direction of the diaphragm 65 to support voice coils, which will be
described later, provided in the through holes of the diaphragm 65 in a magnetic field. Since the
position can be held at the optimum position, it is possible to suppress the rolling operation that
occurs when the diaphragm 65 vibrates largely.
[0071]
The outer periphery of the cap 63 is attached to the inner periphery of the diaphragm 65, and
the inner periphery is attached to the outer periphery of the magnetic circuit 57.
Therefore, the cap 63 supports the inner peripheral portion of the diaphragm 65 so as to be
displaceable in the amplitude direction.
[0072]
As shown in FIG. 5, the magnetic circuit 57 is disposed in the through hole of the diaphragm 65
of the mid-low range vibration system 56, and each of the high-range vibration system 55 and
the mid-low range vibration system 56 is provided. Voice coils 71 and 72 for vibrating the
diaphragms 60 and 65, a center plate 73 for forming a magnetic path, and a pair of magnets 74
and 75 for applying a magnetic flux to the center plate 73 are provided.
[0073]
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The voice coil 71 is attached to the inner circumferential surface of the through hole of the
diaphragm 60 of the high frequency range vibration system 55 with the center line in the
winding width direction aligned with the center line in the thickness direction of the diaphragm
60.
Further, the winding width of the voice coil 71 is formed equal to or less than the thickness of
the center plate 73.
[0074]
The voice coil 72 is attached to the inner circumferential surface of the through hole of the
diaphragm 65 of the mid-low range vibration system 56 with the center line in the winding width
direction aligned with the center line in the thickness direction of the diaphragm 65. Further, the
winding width of the voice coil 72 is equal to or less than the thickness of the center plate 73.
[0075]
The center plate 73 is formed in a disk shape, for example, by a soft magnetic material such as a
hot forged steel plate as shown in FIG. The magnets 74 and 75 use, for example, anisotropic rare
earth sintered magnets such as neodymium magnets, and are formed in a disk shape whose outer
diameter is slightly smaller than the outer diameter of the center plate 73.
[0076]
As shown in FIG. 5, the magnets 74 and 75 are disposed on both sides of the center plate 73 with
the magnetic pole directions for repelling the center plate 73 interposed therebetween and facing
each other. The outer periphery is protruded. That is, although not shown, for example, the
center plate 73 side of each of the magnets 74 and 75 is magnetized in the N pole, and the other
side is magnetized in the S pole, for example.
[0077]
02-05-2019
19
As shown in FIG. 5, the outer periphery of the elastic support member 63 of the high frequency
range vibration system 55 is attached and fixed to the inner periphery of the magnetic circuit 57
configured as described above. In the magnetic circuit 57, a voice coil 72 for vibrating the midlow range vibration system 56 is disposed at the outer periphery, and a voice coil 71 for
vibrating the high-range vibration system 55 is disposed at the inner periphery. It is set up.
[0078]
The frame 58 is formed in a substantially bottomed cylindrical shape by a metal material as
shown in FIG. A holding portion 79 for holding the mid-low frequency vibration system 56 is
formed on the front end side of the frame 58, and the outer peripheral portion of the elastic
support members 66 and 67 of the mid-low range vibration system 56 is formed on the holding
portion 79. Are fixed via an annular edge ring 76. Further, although not shown, the frame 58 is
provided with a connection terminal connected to the voice coils 71 and 72 through a tinsel wire
at an outer peripheral portion, and a connection line of an external power supply is connected to
the connection terminal. ing.
[0079]
In the speaker device 3, the elastic support member 62 prevents the air in the enclosure from
leaking from the gap between the outer peripheral portion of the diaphragm 60 and the inner
peripheral portion of the magnetic circuit 57. In the speaker device 3, the cap 63 prevents the air
in the enclosure from leaking from the gap between the through hole of the diaphragm 65 and
the outer peripheral portion of the magnetic circuit 57.
[0080]
In the speaker device 3 described above, when current is supplied to the voice coils 71 and 72 of
the magnetic circuit 57, the voice coils 71 and 72 vibrate according to the law of Fleming left
hand, and the voice coils 71 and 72 vibrate. Accordingly, the diaphragms 60 and 65 of the high
frequency range vibration system 55 and the middle low frequency range vibration system 56
respectively vibrate to generate sounds.
[0081]
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20
As described above, the speaker device 3 is configured to include the flat plate-like diaphragms
60 and 65, thereby further reducing the thickness in the amplitude direction of the high
frequency range vibration system 55 and the mid low frequency range vibration system 56. It is
possible to make the entire apparatus thinner.
[0082]
As described above, according to the speaker device of the present invention, the first vibration
system and the second vibration system are brought closer by forming magnetic fields on the
inner and outer peripheral portions of the magnetic circuit. Playback sound quality can be
improved.
Further, according to this speaker device, the thickness in the amplitude direction of the first and
second vibration systems can be reduced, so that the entire device can be thinned.
Moreover, according to this speaker device, since a plurality of magnetic circuits are not
provided, the assemblability can be improved.
[0083]
Further, according to the speaker device according to the present invention, the reproduction
sound quality can be improved by disposing and arranging the substantially flat plate-like first
and second diaphragms on the same plane. Further, according to this speaker device, the
thickness in the amplitude direction of the first and second vibration systems can be further
reduced by providing the diaphragm having a substantially flat plate shape, so that the entire
device can be further thinned. Can be
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21
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